SU1416426A1 - Device for controlling braking effort of rope hoist - Google Patents

Abstract

The invention relates to control systems for braking devices of hoisting machines, can be used on hoisting plants of mining enterprises and can improve the safety of lifting equipment operation by selecting and correcting the braking force value depending on the signals from sensors of the path, load, speed, the directions of movement and deceleration, respectively, in the blocks for calculating the period of longitudinal oscillations of the rope, determining the multiplicity of the deceleration time th car rope longitudinal oscillation period, determining the magnitude and direction of action of the load value and generating a braking force and deceleration calculation unit, and determining the magnitude of the braking force correction. Thereafter, the control signal is processed at the braking device. 1 il. (About SL

Description

The invention relates to control systems for braking devices of hoisting machines and can be used in lifting installations of enterprises of the mining industry.

The purpose of the invention is to increase the safety of lifting equipment operation.

The drawing shows a functional block diagram of the proposed device.

The device includes a sensor 1, a load sensor 2, a speed sensor 3, a motion direction sensor 4, a slowdown sensor 5, a unit for calculating the longitudinal oscillation period of the rope, a unit 7 for determining the multiplicity of braking time of the elevator machine for the longitudinal oscillation period of the rope, a unit 8 for determining the magnitude and direction load, block 9 calculation of deceleration, block 10 of forming the magnitude of the braking force, the braking device 11 of the lifting machine 12 and block 13 of determining the magnitude of the correction of the braking force, the source 14 of the reference direct voltage.

The deceleration calculation unit 9 is composed of the multiplication unit 15 and the division unit 16.

The brake force generation unit 10 consists of a multiplication unit 1 and two adders 18 and 19.

The braking force correction unit 13. consists of the adder 20 and the constant multiplication unit 21.

The device works as follows.

In proportion to the magnitude of the reduced mass of the hoist, the unit 6 is supplied with a constant in magnitude and knowledge of the signal from the source 14 of the reference voltage. Sensors 1-5 begin to emit signals from the moment the lift machine 12 starts moving. Sensors 1.2 output signals to blocks 6 and 8, sensor 3 to blocks 7 and 9, sensor 4 to block 8, sensor 5 to block 13. The signals from sensors 1 and 2 in block 6 calculate the period of longitudinal oscillations of the rope. At the same time, the signals from sensors 1, 2 and 4 in the block determine the magnitude and sign of the static load on the hoisting machine, and a signal is sent to block 10.

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The output signals from block 6 are fed to blocks 7.9 and 10. The signals from sensor 3 and block 6 in block 7 determine the ratio of the time the hoist stops to the period of longitudinal oscillation of the rope. The output signal of block 7 is fed to block 9. Based on signals from sensor 3 and blocks 6, 7, block 9 calculates the calculated deceleration of the hoist machine. The output signal of block 9 enters blocks 10 and 13. The signals from blocks 6.8 and 9 in block 10 form the calculated value of the braking force. The output signal of the unit 10 enters the braking device 11, which applies a braking force to the lifting machine 12 in accordance with the output signal of the unit 10. When the coefficient of friction changes, the actual deceleration of the lifting machine will differ from the calculated one. The signals from sensor 5 and block 9 in block 13 determine the deviation of the actual deceleration of the hoisting machine from the calculated one, in proportion to which a signal is given to the block 10, so that the correcting force of the braking force is applied so that the actual deceleration of the hoisting machine becomes equal to the calculated one.

Thus, in the proposed device, the selection and correction of the braking force value is performed depending on the sensor signals. The amount of braking pushes is selected and adjusted so that the lifting machine stops at a time multiple of the period of longitudinal oscillation of the rope. This reduces the dynamic loads in the elements of the lifting unit after stopping the lifting machine.

Claims (1)

Invention Formula A device for adjusting the braking force of a cable lift, comprising a voltage source, the output of which is connected to the first input of the longitudinal oscillation module for the cable, the second and third inputs of which are connected to the outputs of the path and load sensors connected to the first and second inputs of the value determination unit and load direction, the third input of which is connected to the output of the motion direction sensor, the speed sensor connected to the first input of the multiplicity determination unit braking the hoisting machine for the period of longitudinal oscillations of the rope, the second input of which is connected to the output of the block for calculating the period of longitudinal oscillations of the rope associated with the first input of the block for generating the braking force, the output of which is connected to the input of the braking device, in order to increase safety operation of lifting equipment, it is equipped with a deceleration sensor, a deceleration calculation unit and a brake force correction amount determination unit, the first input 16426 d ten 15 which is connected to the output of the deceleration sensor, and the output is connected to the second input of the brake force shaping unit, the third input of which is connected to the output of the load size and direction determining unit, and the fourth input is connected to the output of the deceleration calculator connected to the second input of the determining unit the magnitude of the brake force correction, the first, second and third inputs of the retard calculation unit are connected respectively to the outputs of the block for determining the multiplicity of the braking time of the hoisting machine for a period n rope vibration oscillations, rope length oscillation period calculator and speed sensor.